Depends on where I buy it. My local HFS used to have some packages that still had weeks to go before the expiration date and they were green-molded in the fridge. I've bought stuff from there that went moldy within days. I've had some of this stuff mold while in the freezer.

But now my Stop and Shop sells it (only the cheddar or mozzarella shred) and like others have mentioned, I can keep an open pack for a month and it'll last just fine.

I must have a store that always has old dayia being sold, cause the shreds go bad in like 4 days if I don't freeze them. I've also bought bags that were already totally green and fuzzy inside, so check as best you can at the store too.

But now my Stop and Shop sells it (only the cheddar or mozzarella shred) and like others have mentioned, I can keep an open pack for a month and it'll last just fine.

I spoke too soon. I bought & opened a pack just 2 weeks ago and when I went into it this morning almost the whole thing was green mold. Yecch! That hasn't happened to me in years! I guess they'll have to go right into the freezer when I buy them again.